This is the fault of manufacturers fixing supply, especially in the case of micron, one of only 3 memory chip manufacturers, deciding to flip the bird to the non-AI consumer market.
Is this the "fault" or is it just the result of rational economic actors?
Oligopolies don't get to use the market forces defense.
When rational economic actors have enough power, and use that power to decrease the competitiveness of the market, they gain increasing amounts of "fault".